Ice cube tray



FIG. 1 is a perspective view of an ice cube tray showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof, the other three sides being identical thereto; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for an ice cube tray, substantially as shown and described. 